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The structural, electronic, optical and elastic properties of perovskites ofthe $\alpha$-, $\beta$- and $\gamma$-phase family CsSnI$_{3-x}$Cl$_x$ (x = 0,1, 2, 3) are analyzed by ab initio methods using GGA, SCAN and HSE06. It isfound that the lattice constants of CsSnI$_{3-x}$Cl$_x$ decrease withdecreasing anion size from I to Cl, and when passing from CsSnI$_3$ toCsSnCl$_3$, the band gap width decreases slightly at the beginning and thenincreases. The optical characteristics were evaluated and it was found that the$\alpha$-, $\beta$-phase of CsSnI$_{3-x}$Cl$_x$ at $x=1$ has a wide absorptionrange and high absorption coefficients compared to other Cl concentrations. Theelastic constants of $\alpha$-CsSnI$_{3-x}$Cl$_x$ perovskite have beencalculated and their bulk moduli, shear moduli, sound velocities and Debyetemperatures under pressure in the range from 0 to 30 GPa have been considered,with the external pressure induction increasing in steps of 5 GPa. Thesematerials are found to be mechanically stable perovskites according to Bornstability criteria and low bulk moduli. Thus, we predict that perovskites ofthe CsSnI$_{3-x}$Cl$_x$ family are good candidates for optical materials usedin solar cells.

Electronic, Optical and Elastic Properties of Perovskite CsSnI$_{3-x}$Cl$_x$ (x = 0, 1, 2, 3): Using First Principles Study